1. Actually I'm trying to copy files from my internal hard drive to an external drive (boths a USB FLASH and a 1 terabyte WD external Hard Disk) and not the other way around. I have had problems with mp3 mkv and mp4 files. When the total size of file or
batch group of files reaches about 1GB (more or less) the speed begins to decrease.

2. The speed is stated in the Windows Explorer Popup which is shown when files are transfering.

3. Chipset is the most current available. I have checked.

4. I haven't tried to reinstall USB controllers as I'm not sure how to. My computer was manufactured only 6 months ago.

5. I have tried the External Hard Drives and Flash drives on machines operating Windows XP and did not experience this problem.

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